A Novel Scheduled Power Saving Mechanism for 802.11 Wireless LANs

He, You; Yuan, Rui

doi:10.1109/tmc.2009.53

Cited by 74 publications

(9 citation statements)

References 15 publications

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“…16 shows the energy consumption of the radio and SRAM buffer for different sampling rates obtained from the experiments. As shown in this figure, we compare the energy consumption of the CAM and PSM transceivers with a fixed buffer size (512Kbyte) [12], and that of the PSM transceiver with the/an optimal buffer sizing method (hereafter, Opt_PSM). Fig.…”

Section: Resultsmentioning

confidence: 99%

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Lifetime Maximization of Wireless Video Sensor Network Node by Dynamically Resizing Communication Buffer

2017

KSII TIIS

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Reducing energy consumption in a wireless video sensor network (WVSN) is a crucial problem because of the high video data volume and severe energy constraints of battery-powered WVSN nodes. In this paper, we present an adaptive dynamic resizing approach for a SRAM communication buffer in a WVSN node in order to reduce the energy consumption and thereby, to maximize the lifetime of the WVSN nodes. To reduce the power consumption of the communication part, which is typically the most energy-consuming component in the WVSN nodes, the radio needs to remain turned off during the data buffer-filling period as well as idle period. As the radio ON/OFF transition incurs extra energy consumption, we need to reduce the ON/OFF transition frequency, which requires a large-sized buffer. However, a large-sized SRAM buffer results in more energy consumption because SRAM power consumption is proportional to the memory size. We can dynamically adjust any active buffer memory size by utilizing a power-gating technique to reflect the optimal control on the buffer size. This paper aims at finding the optimal buffer size, based on the trade-off between the respective energy consumption ratios of the communication buffer and the radio part, respectively. We derive a formula showing the relationship between control variables, including active buffer size and total energy consumption, to mathematically determine the optimal buffer size for any given conditions to minimize total energy consumption. Simulation results show that the overall energy reduction, using our approach, is up to 40.48% (26.96% on average) compared to the conventional wireless communication scheme. In addition, the lifetime of the WVSN node has been extended by 22.17% on average, compared to the existing approaches.

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Section: Resultsmentioning

confidence: 99%

“…In Eq. (11) and (12), and _ represents he radio power consumed in the IDLE and Tx/Rx states, respectively. In Eq.…”

Section: E E Ementioning

confidence: 99%

Lifetime Maximization of Wireless Video Sensor Network Node by Dynamically Resizing Communication Buffer

2017

KSII TIIS

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“…Moreover, a prioritized scheduling method with consideration of fairness is adopted to arrange the orders of allocated SPs, and thus the nodes with a high priority can retrieve their traffic earlier than the low priority nodes, while the low priority nodes allocated their own channel access time. Compared to the scheduled scheme in [6], our proposed method allows the node really active in current BI to reserve channel, which avoids long period of empty channel. And compared to the power saving strategy proposed in [8], our scheme eliminates the power consumed in idle channel and channel contentions by channel reservation, which can save power more efficiently.…”

Section: Discussionmentioning

confidence: 99%

“…Both of the above proposals are based on the same approaches allowing the AP to manage the wakeup/sleep time of nodes, using the designed scheduling mechanisms. Different from their approaches, He and Yuan [6] propose a TDMA-based MAC protocol for alleviating the contentions among nodes. AP divides a beacon period into a number of equal time slices, each of which is allocated to a single node or a group of nodes.…”

Section: Related Workmentioning

confidence: 99%

“…Another simulation is performed to study how the position of a scheduled SP affects the performance of proposed scheme, in comparison with analytical results. We use the simulation scenario given in [6]. Downlink streams are set up from AP to three PSM nodes with different priorities, and the positions of the scheduled SPs within a beacon period are varied.…”

Section: Simulationsmentioning

confidence: 99%

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Enhancement of the IEEE 802.11 Power Saving Mode by Prioritized Reservations

Rhee

2015

International Journal of Distributed Sensor Networks

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The increasing demand for real-time applications in WSN has raised the requirement of protocols considering both energy efficiency and end-to-end delay. A PSM is proposed in the IEEE 802.11 protocol to reduce the power consumptions of wireless nodes. Wireless nodes can stay in doze mode and periodically wake up to retrieve the frames buffered in the APs. However, the 802.11 PSM is not such energy efficiency for WSN. First, in the process of the node's transmitting polling frames to AP, channel contentions may cause sensor nodes to deplete power quickly. Second, the mechanism of retrieving buffered frames can be inefficient since a polling frame is able to pick up only one data frame. Third, a prioritized service for urgent needs is not supported. In this paper, we propose a prioritized reservation scheme to enhance the IEEE 802.11 PSM. The concept of PSCW is suggested, during which PSM sensor nodes can retrieve the buffered frames using the reserved SPs, where the priorities of the PSM nodes are considered in scheduling the SPs. Through analytic models and discrete simulations, we show that our proposed mechanism outperforms the existing PSM schemes in terms of energy efficiency and prioritized services.

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An analysis of energy consumption for TCP data transfer with burst transmission over a wireless LAN

Hashimoto

Hasegawa

Murata

2014

Int J Communication

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SUMMARYA common strategy for energy saving in wireless network devices is to remain in sleep mode for as long as possible. The timing of packet transmission and reception depends on the behavior of the transport-layer protocols used by upper-layer applications. Therefore, understanding the relation between the behavior of the transport-layer protocols and energy efficiency using sleep mode is important for effective energy saving, especially when a wireless network interface (WNI) is activated in sleep mode at packet interarrivals. In this paper, we analyze the energy consumption of a client's WNI in Transmission Control Protocol (TCP) data transfer over a wireless LAN by focusing on the detailed behavior of TCP congestion control mechanisms. This model considers three situations: the WNI is activated in continuously active mode, in sleep mode, and in sleep mode with burst transmission. The latter is proposed as an effective method to improve energy efficiency, which lengthens sleep periods by transmitting and receiving multiple packets in a bursty fashion. Through numerical examples, we show that sleeping without modification of transmission timing reduces energy consumption in TCP data transfer by only around 10%, and that the burst transmission can contribute further 50% energy reduction.

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A Novel Scheduled Power Saving Mechanism for 802.11 Wireless LANs

Cited by 74 publications

References 15 publications

Lifetime Maximization of Wireless Video Sensor Network Node by Dynamically Resizing Communication Buffer

Lifetime Maximization of Wireless Video Sensor Network Node by Dynamically Resizing Communication Buffer

Enhancement of the IEEE 802.11 Power Saving Mode by Prioritized Reservations

An analysis of energy consumption for TCP data transfer with burst transmission over a wireless LAN

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